Considering a handful of creative community members enjoy creating graphical effect packs, music packs, and sound effect packs, why not create a subforum where all these can be listed? Most of the threads eventually get left behind and the glorious reskins of the game are left forgotten to most people.
On top of that, the community itself hasn't really "decided" which subforum these belong in. Sometimes they are in the Media Center, sometimes in the Freelancer Forum, sometimes in the Discovery Mod General Discussion. It's quite a mixup.
This doesn't need a subforum, what it needs is a pinned megathread with everything compiled there. The problem is that anyone with the capacity to do so has too much on their plate to handle it.
I can put some time away for this if you'd like. I'll have a look through the Media Center, Freelancer Forum & Mod General and see what I can find. If you have ideas in mind, PM them to me and I'll incorporate them.